python check is not NaN dataframe code example

Example 1: check if a value in dataframe is nan

#return a subset of the dataframe where the column name value == NaN 
df.loc[df['column name'].isnull() == True]

Example 2: find nan value in dataframe python

# to mark NaN column as True
df['your column name'].isnull()

Example 3: to detect if a data frame has nan values

df.isnull().sum().sum()
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